Hanna high range copper checker questions

https://www.triton.de/en/

kartrsu

Member
View Badges
Joined
Apr 20, 2019
Messages
85
Reaction score
45
I’ve been testing copper in my tanks and RODI with the Hanna copper checker and I’m questioning the results. I have been getting low readings of copper in my display around .07 ppm. Also my 5 stage rodi is showing .01ppm which is strange since I changed my carbon/mechanical/resin a month ago. My tap is .40 ppm.

I did an icp test on my display a few weeks back and results showed .002ppm, so I wonder if my Hanna checker just can’t read low to no levels of copper well. So far my corals and inverts are totally fine. I have never dosed copper into the tank, none of my equipment is rusting.

I’m also pretty diligent about my testing method. Always rinse vials with rodi, align 10ml sign to same place, and swirl vs shake until full dissolution. Oils and finger prints wiped clean all the way. I notice that the vial becomes a little cloudy once I add the reagent, when it should turn purple at higher levels. Micro bubbles still show up but I do my best to minimize it. I checked with Hanna on the batch of reagents and no issues.

Can people share their experience with the checker on the display? I’m doing another icp test of my tank and rodi. Since everything looks okay, should I just turn a blind eye? In the meantime I’m just running cuprisorb, polyfilter and Carbon as safety.

Thanks for the help!
 
https://www.omegasea.net/
OP
K

kartrsu

Member
View Badges
Joined
Apr 20, 2019
Messages
85
Reaction score
45
I’ll add that I use reef crystals as my salt and have been using rusted stainless steel tongs and tweezers to feed food. Could these be contributing factors? Nonetheless, differential vs icp test is strange.
 

Randy Holmes-Farley

Reef Chemist
View Badges
Joined
Sep 5, 2014
Messages
38,234
Reaction score
26,174
Location
Arlington, Massachusetts, United States
You almost certainly do not have that level of copper.

Nearly everyone gets that false reading.

Do not measure a normal reef tank with this device. it is not accurate at the low end.
 
Top Shelf Aquatics
https://www.triton.de/en/

Is your current reef tank the BEST reef aquarium you've ever had?

  • Yes

    Votes: 208 68.6%
  • No

    Votes: 69 22.8%
  • It's a tie

    Votes: 11 3.6%
  • Other (please explain)

    Votes: 15 5.0%

Online statistics

Members online
2,338
Guests online
5,000
Total visitors
7,338
Top